Check out the specs for my mother board
here. I have a gigabyte GA-8IPE1000 (Rev 4.x).
Memory specs:
1. Type: Dual Channel DDR 400 / 333 / 266 support
2. Max capacity: 4 GB (Please read FAQ for further information)
3. DIMM slots: 4
* Due to standard PC architecture, a certain amount of memory is reserved for system usage and therefore the actual memory size is less than the stated amount.